I dove a 2011 DD15 with 600k it leak oil so bad had to put oil in it every day it last a week than they took it back.i drove a 2013 with 406 k it leak oil not bad as the 2011.i currently drive a 2002 12.7 frame have over 2.5 million miles engine have 800k on a rebuild it is Bone dry high blow-by and I don't add between oil change every 15k.i have a friend with a DD15 and it's leaking from every possible place right now.to be fear all dd-15 leak oil.Be safe out there